Question

46,054,202 round the underlined number the 5 isunderlined 

Answer 1

if 5 is to be rounded off, then the rule is, if the next significant digit is equal or greater than 5 it adds up, other wise not..
In this case the next significant digit is 0 which is less than 5 so it will not be added up.

46,054,202 ≈ 46,000,000 Answer